Attachment for ratchet-drills.



PATENTED MAR. 7, 1905.

A. B. CARLL.

ATTACHMENT FOR RATGHET DRILLS.

- APPLICATION FILED 00T.14,1903.

attenua- Patented March 7, 1905.

PATENT 'FFIGE.

ADDISON B. CARLL, OF BOOTHWVYN, PENNSYLVANTA.

ATTACHMENT FOR RATCHET-DRILLS.

SPECIFICATION forming part of Letters Patent No. 784,301, dated March 7, 1905.

Application filed October 14,1903. Serial No. 177,051.

To a, whom, it may concern.-

Be it known that I, ADDISON B. CARLL, a citizen of the United States, residing at Boothwyn, in the county of Delaware and State of Pennsylvania, have invented a new and useful Attachment for Ratchet-Drills, of which the following is a specification.

The invention relates to an attachment for ratchet-drills for bracing or backing up the same.

The object of the present invention is to improve the construction of the means employed for bracing or backing up ratchet-drills and to provide a simple, inexpensive, and efiicient device of great strength and durability capable of adjustment to accommodate ratchet-drills of different lengths and drill points or bits of various sizes and adapted to be easily and quickly adjusted to a ratchet-drill.

A further object of the invention is to provide a device of this character capable of maintaining a drill in alinement with a brace or bar and adapted to support the drill adjacent to the end of the bit, whereby a stiff brace or support is provided.

A further object of the invention is to provide a device of this character designed particularly for use when boring holes into the sides of a boiler-tank or similar object and adapted to be readily varied in length for firmly engaging the wall or side of such object at a point diametrically opposite that at which the drill is boring.

\Vith these and other objects in view the invention consists in the construction and novel combination and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings, and pointed out in the claims hereto appended, it being understood that various changes in the form, proportion, size, and minor details of construction within the scope of the claims may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

In the drawings, Figure l is a side elevation, partly in section, of a device constructed in accordance with this invention and shown applied to a ratchet-drill. Fig. 2 is a sectional view on the line QZof Fig. 1. Fig. 3 is asimilar view taken on the line 3 3 of Fig. 1. Fig. 1 is a plan view illustrating the manner of blocking up or bracing a ratchet-drill in a tank or boiler and showing a slight modification of the invention.

Like numerals of reference designate corresponding parts in all the figures of the drawings.

1 designatcsa supporting-arm having angularly-disposed endsQ and 3 arranged approximately parallel, the inner end 2 being provided with an integral head, which, as clearly illustrated in Figs. 1 and 3 of the drawings, is in the form of a clamp 4 for engaging a shank or member The head of the end 2 is provided with a circular opening and is split at a point diametrically opposite the arm to form two clamping members or sides, which are provided at their outer ends with ears 6. The ears 6 are perforated and are connected by a screw 7. The perforation of one of the ears 6 is threaded to engage the screw 7, which is provided with a polygonal head adapted to be engaged by a wrench or similar tool for causing the clamp to engage and release the shank. The lower end of the clamp or head is closed by the shank or member 5, which is provided with a centering notch or seat 8 for the reception of the rear end of a hand ratchetdrill'9. The tubular shank or member is interiorl y threaded at the outer or upper end to receive an extension-screw 11, which is adapted to be rotated to move it inward and outward. The shank or member 5 and the screw 11 form an adjustable backing-up brace, which is adapted to be varied in lengthand which forms a firm bearing for the ratchet-drill. The ratchet-drill is held perfectly steady and true by the outer arm 3 of the support 1,

which spans the drill from the inner end of the arm or support 1 by a clamping-screw 15, mounted in a threaded perforation of the end 3 at one side of the opening thereof and engaging the guide block or piece, as clearly indicated in Fig. 2 of the drawings. The guide block or piece .is detachable to enable guide blocks or pieces having drill-receiving openings of different sizes to be placed in the aperture of the end 3 to accommodate drills of different sizes. The supporting-arm 1 is adapted to receive the drill near the outer end thereof, and it is capable of holding a ratchet-drill perfectly steady and in true alinement with the adjustable bracing or backing-up device. The clamp at enables the supporting-arm to be adjusted relative to the tubular shank or member 5 to move the abutment for the rear end of the drill toward and from the guiding means I for the tool of the drill, whereby the device may be readily arranged to accommodate ratchet-drills of different lengths, and the adjustment of the screw 11 on the tubular shank or member 5 permits the engaging end of the adjustable bracing 0r backing-up device to bear firmly against the wall or engaged part at all times. After the shank or member and the arm are adjusted the clamp is set, and the parts are then maintained in fixed relation during the operation of the drill. The adjustment of the screw does not affect this fixed relation between the arm 1 and the shank or member.

The screw 11 is preferably provided with a coupling 16, engaging exterior threads 17 of the screw and adapted to receive a rod or pipe 19 in the manner indicated in Fig. 4c of the drawings, whereby the adjustable brace or backing-up device may be extended or lengthened tothe desired extent. The screw is also provided with an outer projection 20 of less diameter than the coupling and extending through and beyond the same to afford a bearing or engaging portion for the screw when an extension pipe or rod is not employed. Extension pipes or rods of different lengths may be coupled to the screw, and by this means a supporting-brace or backing-up device of any desired length may be readily obtained to suit the requirements of the place in which the hand-drill is operated.

In Fig. 4 of the drawings the head 23,

which is formed integral with the supportingarm 23, has its lower end closed by an integral portion, which is provided with a centering notch or seat for the reception of the rear end of the drill. The shank or member 21, which extends from the head 23, is provided with a coupling 22 for the reception of an extension rod or tube 19. The extension rod or tube and the shank or member constitute a backing-up brace, and the adjustable connection between the same does not affect the fixed relation between the shank or member and the arm 23.

The outer end of the arm 23 is provided with a guide block or piece 24, detachably held in place by suitable fastening devices 25 and adapted to be removed for a purpose heretofore explained.

The device is adapted to be applied to a hand ratchet-drill, as shown in Figs. 1 and L,

and it will be found especially advantageousin drilling holes in the sides of boilers, tanks, and analogous receptacles, and it is capable of ready adjustment to various lengths to suit the size of the boiler or tank operated on.

It will be seen that the device is exceedingly simple and inexpensive in construction, that it is adapted to be readily applied to drills of different lengths and different diameters, and that it is also capable of being varied in length to adapt itself to the space in which a handdrill is to be operated. Furthermore, it will be clear that it is adapted to hold a drill and a bracing device firmly in alinement with each other and that it is capable of supporting the drill near the end thereof, whereby holes may be accurately bored. Also it will be apparent that the device will obviate the necessity of piling up a series of blocks or pieces to brace a drill and that the device is susceptible of use in places where it would be very inconvenient to use such blocks.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The combination with a ratchet-drill, of an attachment therefor, comprising a backingup brace, and an arm extending from the backing-up brace and arranged lengthwise of the drill so as to span the same from the rear or upper end thereof to the tool and provided with means for guiding the latter, said arm being provided with a head forming an abutment receiving the rear or upper end of the drill, said abutment maintaining a fixed relation with respect to the arm during the operation of drilling, and the said backing-up brace being extensible, substantially asdescribed.

2. In combination with a ratchet-drill, of an attachment therefor, comprising a backing-u p brace having a seat at its lower end, an arm arranged lengthwise of the drill so as to span the same from the rear end thereof to the tool and provided with guiding means for the latter, and having a clamp engaging the backing-up brace and having its lower end closed by the same, said seat receiving the rear end of the drill andbeing held in fixed relation with the arm of the clamp during the entire operation of the drill, and the said backing-up brace being extensible to feed the drill, substantially as described.

3. In combination with a drill, an attachment therefor, comprising a tubular shank or member receiving and supporting the inner end of the drill, an arm carried by the shank or member and spanning the drill from the In testimony that I claim the foregoing as inner end thereof to the tool and provided my own 1 have hereto aflixed my signature in with means for guiding the latter, ascrew enthe presence of two Witnesses.

gaging the shank or member and having a ADDISON B. CARLL. 5 projection, and a coupling mounted on the l/Vitnesses:

screw and terminating short of the projection ELISHA H. BREWSTER,

and adapted to receive an extension-rod. GUY W. CURRIER. 

